Explosive-engine



'(No Model.)

H. F. FRASER. EXPLOSIVE ENGINE.

No. 526,348. Patented Sept. 18, 18 94.

2 SheetsSheet 2.

NITED v STATES PATENT OF IC HENRY F. FRASER, OF ANTIOCH, CALIFORNIA.

EXPLOSIV'E-ENGINE.

$PECIFICATION forming part of Letters Patent No. 526,348, datedSeptember 18, 1894.

' Application filed September 19,- 1893. Serial No. 485,875. (No model.)

T0 at whom may concern:

Be it known that I, HENRY F. FRASER, a citizen of the United States,residing at Antioch, Contra Costa county, State of California, haveinvented an Improvement in Ex:- plosive-Engines; and I hereby declarethe following to be a full, clear, and exact description of the same.

My invention relates to the class of explosive engines, and especiallyto those engines which receive an explosive charge at each endalternately.

It consists in the novel construction and arrangement of the main andcompression cylinders, the pistons operating therein and the severalpassages and controlling valves, together with the igniting or sparkingmechanism, all of which I shall hereinafter fully describe and claim.

The object of my invention is to provide a simple and effective doubleacting explosive engine.

Referring to the accompanying drawings for a more complete explanationof my invention-Figure 1 is a vertical longitudinal section of myengine. Fig. 2 is a section on line 00-90 of Fig. 1. Fig. 3 is a topview of the main cylinder and exhaust valves.

A is the main cylinder provided with a water-jacket a and with suitableheads a.

B is the piston working Within the cylinder and having a. rod b whichpasses outwardly through a suitable stuffing-box b in the lower head aof the cylinder. Both piston and rod are made hollow as shown in Fig. 1,to contain water by which they are kept cool, a requirement veryessential in a double acting engine where these parts are liable toquickly become heated.

O is the compression. or charge cylinder. This may be connected andarranged with respect to the cylinder A by any suitable means, hereshown as being located to one side thereof with the inlet passagesintervenlng.

Within the compression cylinder is mounted the piston D, the rod (1 ofwhich passes down through its lower head in a suitable stuflingbox (1.

The cylinder 0 is connected at its uppere, and said cylinder isconnected at its lower end with the lower end of the cylinder A bypassages E E having a suitable controlling valve e.

F is theinlet for the explosive charge, oom- "municating with the upperend of the compression cylinder 0, and provided with a suitable valve,not shown.

F is the inlet for the, explosive charge communicating with the lowerend of the cylinder O, and provided with a suitable'valve, not shown.

G is the exhaust from the upper end of cylinder A, having a valve g, andG is the exhaust from the lower end of the cylinder, having the valve g.

H is the engine shaft with the crank it of which the piston rod 1) isconnected. Upon this shaft is an eccentric h which operates the rod 01of the compression piston D. This shaft also carries cams 71 and h whichoscillate levers I and 1 respectively, and upon which the stems g and gof the exhaust valves g and g respectively rest.

Within the passages E and E are formed the explosion chambers J and Jand in these are located the igniting devices or electrodes. One ofthese electrodes in each chamber is designated by K. Its inner end isbeveled as shown, and it is controlled by a spring 7a which holds it in.The other electrode is K, the inner end of which is also beveled, and italso is controlled by a spring is which holds it in. The beveled pointsof the two electrodes are normally held separated, and they are suitablymounted with respect to proper insulation common in such cases.

The outer end of each electrode K has a stop or contact button 10against which the ends Z of a centrally pivoted rocking lever L,interposed between the pairs of electrodes, alternately come in contact.This rocking lever is actuated bya rod M which is itself operated by aneccentric Won the main shaft H.

The operation of the engine is as follows: As the piston D in thecompression cylinder 0 moves downwardly, it compresses and forces theexplosive charge from below it through the passages E E into theexplosion chamber J, wherein it is ignited, and the expandinggasesentering the lower end of cylinder A, the. piston B is driven onits upward stroke, the previous products .of the explosion Ibein gdriven out through the exhaust passage G and valve 9 which is then open.The downward movement of the compression piston D draws in anotherexplosive charge into the compression cylinder 0 above it, and upon theup stroke of the piston D, this charge is forced through the passage EE, into the upper explosion chamber J, and is there exploded above thenow descending piston B which is thereby driven on its downward stroke,the previous productsof explosion being exhausted through the lowerpassage G, the valve g of which is at this time opened. Thus a doubleacting ex-' plosive engine is obtained, of simple construction andeffective in operation.

The spark is effected by the electrodes as follows: The rocking lever Lbearing against the stop button 10 of the electrode K, draws saidelectrode outwardly, and upon being rielieved said electrode springs inand is thrown far enough to come in contact with the electrode K, thecontact being a yieldingone due to the spring control of both. Thiscontact is but momentary and upon the rebound or return of theelectrodes to normally separated position, the spark is eifected. Thebeveled ends of the two electrodes insure perfect contact and separationwith theminimum of friction and jar, and in addition thereto, tend byascraping contact to keep their surfaces clean.

Having thus described my inventiomwhat I claim as new, and desire tosecure by Letters 5 Patent, is-v 1. In a double-acting'explosiveiengine,the 1 combination of a main cylinder with its pis-- for alternatelywithdrawing one of the elec- I trodes, of each pair whereby upon saidelectrode being relieved it will spring into contact with the opposingelectrode and will be caused to instantly rebound and become normallyseparated therefrom.

2. In an explosive engine, the normally separated electrodes eachcontrolled by a spring, in combination with a pivoted lever having itsfree end adapted to contact with and withdraw one of the electrodeswhereby upon said electrode being relieved it will spring into contactwith the opposing electrode and will becaused toinstantly rebound andbecome normally separated therefrom.

3. In an explosive engine having explosive chambers and passagesconnectingthem with each end of the main and compression cylinders, theelectrodes arranged in lineand each connected with a spring wherebytheir inner ends are normally separated, a centrally-pivoted leverinterposed between each pair ofzthe electrodes having its freeendsadaptedlto engage the electrodes to withdraw them, and'a rodfrom theengine shaft too perate thelever.

4. In "an explosive engine having explosive chambers, electrodesarranged in pairs with the electrodesof each pair in line,acentrallypivoted rocking-lever interposed between the pairsofelectrodes and having its free'ends adapted to engage a'contactor buttonon one member of each pair of electrodes for withdrawingsai'd members,and springssconnected with the electrodes of each-pair'whereby theelectrodes normally separate after contact, and means for operating thelever.

In witness whereof I have hereunto set my hand.

HENRY F. FRASER. Witnesses:

S. H. NOURSE, H. F. Asonnox.

